What Does "responsive" mean? 

Unlike “smart” bulbs, which simply provide the ability to adjust your lights from a smartphone, your Stack lights automatically respond to changes in their environment's ambient light and time by adjusting brightness and color temperature without user intervention.

Can I adjust my Stack lights via an app?

Yes. Although we strive to minimize the need for user interaction, the Stack Lighting app allows you to customize several of the features that come built-in. Those include:

  • Changing the color temperature from 2700K (yellowish white) to 6500K (bluish white)
  • Changing the brightness level floor and ceiling (minimum and maximum)
  • Scheduling changes for both color temperature and brightness
  • Scheduling wake-up times
  • Turning off occupancy and ambient light sensors
  • ...and more!

Native versions of the mobile application are currently available for iOS and Android. We are also planning to release a web application for computers and other mobile platforms in the future.

Can my Stack lights be adjusted via a computer / browser?

We currently only support adjustments via our Stack Lighting application on mobile devices, however, a browser based interface will be released in the upcoming months to expand user options. Stay tuned!

Can I control my lights from outside of my home via the Stack Lighting app?

Absolutely! Unlike other "smart" devices which require your presence, you can control your Stack lights using the mobile application from anywhere there’s an Internet connection.

What is the expected lifespan of your lights?

Our Stack Downlight is rated for 30,000 hours and Stack Classic for 20,000 hours providing years of use from each Stack light.

Are Stack lights compatible with any dimmers?

Stack lights will dim on a traditional dimmer switch by taking the adjusted dimmer level into consideration when determining max brightness, up to a point. However, because of the technology incorporated inside, a minimum voltage level is required. Therefore, dimming below this minimum voltage level will cause your Stack lights to turn off, flicker, or behave in other unintended fashions which is why we do not recommend using dimmer switches.

Can I use my Stack lights outside?

Currently we do not have lights designed for outdoor use, but we may have iterations in the future that will better suit the rugged needs of an outdoor light bulb.

What is the role of the hub?

Think of the hub as the controller for your lighting system; it transforms every Stack light you own into a network that you can easily control. Stack lights communicate with each other and the hub via ZigBee, which is capable of mesh-networking. This means each light serves as a conduit to the other lights, providing range extension from the hub. One hub can power an entire warehouse of Stack lights.

How many lumens do Stack lights output at max brightness and how much power will they consume?

A Stack Downlight consumes 13 watts of power while producing a maximum of 750 lumens and a Stack Classic produces 800 lumens with 12 watts of power. However, because Stack bulbs are responsive to both the amount of light present and occupancy, our pilot test sites have seen a reduction of 40-60% in actual energy used.

What is the Color Rendering Index (CRI) for the Stack lights and what does it mean?

The CRI describes how well a light source illuminates color, as compared to natural light. A CRI of 100 means that a light source illuminates color as well as natural light, while a CRI of 50 means that a light source illuminates color only half as well as natural light. All Stack lighting formats will have a CRI of 80+. 

What is the beam angle?

The beam angle describes the width of the light emitted from the bulb. A bulb with a high beam angle can light up a larger area than one with a low beam angle. Stack Downlights have a beam angle of 120 degrees which distributes the light over a smaller area than the Stack Classics which have a beam angle of 270 degrees.

What is the color temperature range for Stack lights and what does it mean?

Stack Downlights have a color temperature range of 2700 - 6500K while Classics range from 2200 - 5000K.

Color temperature is most simply described as a method of characterizing the color of light, usually either warm (yellowish) or cool (bluish), and measuring it in Kelvin (K). Standard Incandescent bulbs typically measure around 2700K, where direct sunlight measures around 5500K.

What is the warranty on my Stack lights?

Stack lights come with a two-year warranty policy, covering any defects in material or workmanship that may arise. You can review our full warranty here: http://stacklighting.com/warranty

Can I transfer ownership of my Stack bulbs?

Yes, if the bulbs are remaining with the house, we can delete your user information and sign up the new user. Or, you can take your beautiful Stack lights with you.

When will Stack be shipping internationally?

Right now our teams are focused on certification and testing of the Stack lights.

You can find information about our different form factors in our store. We certainly plan on expanding our offering of lighting formats as we develop a better sense of what our customers would like to see us produce. We will look at product roll out plans in other countries after our first products are established in the U.S. market.

Is there a developer’s kit or APIs available?

We recently released our APIs at developers.stacklighting.com. If you are interested, please contact [email protected].

Can others with the Stack app get access to my lights?

The only way for someone to access your Stack system is for the administrator on your account to grant him or her access. A third party who has not been granted access by the administrator will be unable to gain access to control your lights.

Where can I buy Stack lights?

For now, you can order Stack products directly from our online store or Amazon. You will need either a Downlight or Classic Starter Kit to create your first system of Stack lights as this is the only means to get a Stack Hub. Purchase any combination of our individual lights to expand on the initial two bulbs.

Is my data secure? Will you ever give my data to third parties?

We use industry standard methods including AES 128 bit encryption to secure all transmissions between Stack devices as well as to our cloud servers. Data is anonymized and will not be given out to third parties without your explicit consent and authorization.

How will Stack lights interact with my current lighting control system?

We are currently working to partner with other lighting control systems through our Stack Enabled program. Users can take advantage of our built in IFTTT integration which will open many new possibilities now and in the future. Stack lights will soon be controllable through Alexa and we have plans to expand further with Apple's HomeKit ecosystem.

Can I link my other connected bulbs to Stack Lights?

By integrating with IFTTT, you can link other connected lights to your Stack Lights. For example, you can use this recipe to turn on your Philips Hue bulbs when occupancy is detected by Stack. This can also be done with your LIFX bulbs here.

When will other formats be available?

We are currently taking preorders for the Stack Classic, an A19 bulb format, with an expected ship date later this summer.

What kind of fixtures will the Stack lights fit in?

The Stack Downlight is a BR30 bulb format designed to work in recessed ceiling cans with a diameter of 5 inches or greater. The Stack Classic is an A19 bulb format which will fit in most fixtures designed for a standard incandescent bulb. 

How do you manage roles/access control for multiple users on the system?

The Stack system has the ability to have multiple users with permission-based access controls, so you can control who is able to adjust your lights.

How are updates administered?

All of our updates will be administered remotely over-the-air so our users don’t have to do any work. However, your Stack lights must have power and be connected with your Stack Hub to receive the automatic updates. For this reason, we recommend leaving your light switches engaged at all times and allowing the Stack lights to turn themselves off or turning them off using the Stack Lighting application.